Half to joseph f



(NQ Model.)

A. A. PLUMMER. STEAM GENERATOR.

Patented Apr. 30, 1895.

15m/wim? 1H: "cams Fneas co.. Hmmm-No.. wAsr-lmcwu. nA c.

ABNER A. PLUMMER, OF PUTNAM, CONNECTICUT, ASSIGNOR OF ONE- HALF TOJOSEPH F. GARY, OF SAME PLACE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 538,624, dated AprilSO, 1895.

Application filed February 26, 1894. Serial No. 501,468- (No model.)

To @ZZ whom it may concern,.-

Be it known that I, ABNnR A. PLUMMER, of Putnam, in the county ofWindham and State of Connecticut, have invented a new and usefulImprovement in Steam-Generators, of which the followingris aspecification.

My invention relates to an improvement in steam generators in whichprovision is made for enlarging or diminishing the size of the generatorby utilizing a'greater or lesser number of similar sections and with theobject in View of providing a compact and economical generator whichshall expose a very great amount of surface to the direct action of theflame and in which the structure of the parts shall be for the greaterpart on circularlines to increase strength.

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figure l is a view of the generator invertical central section, showing a generator of three superposedsections. Fig. 2 is a front view of the generator with the wallpartially broken away and showing two superposed sections, and Fig. 3 isa transverse section through the generator on line a: a: of Fig. l.

The wall which forms a setting for the generator, is denoted by A andmay be made of brick or any other suitable material and of `a heightcorresponding to the number of superposed sections ofwhich the generatoris to consist. The wall herein shown is of suitable height for thesetting of a generator of three superposed sections and if two sectionsonly were employed, the wall might be made proportionately lower,terminating for example in Fig. 2, on aline even with the top of theuppermost section therein shown'instead of the full height for threesections, as represented.

The re pot is denoted by B and the air for supporting combustion entersthrough the base wall at a, and, after circulating around the tire-pot,passes down into the ash pit C and thence up through the grate b.

The generator proper consists of one or more dish-shaped orconcave-convex sections quite similar in their general structure andarranged to tit one upon another, so as to form tight joints betweentheir interiors for the circulation of the liquid through them from oneto another and at their peripheries forming a tire wall for surroundingand retaining the products ot' combustion between the chambers formed bythem.

The three superposed sections (represented in Fig. l) are denotedrespectively by D,D and D2 and they consist of a comparatively narrowhollow web portion d, radiating obliquely from a central hollow hubportion d and terminating at their outer edges in depending oblongannular portions d2. The lower ends of the depending annular portions d2are rounded, as shown at d3, to lit corresponding seats d4 on the upperouter portions of the next adjacent section below.

The central hollowfhub portions el are provided at their upper edgeswith an annular groove d5 and at their lower ends with an annular tongued6, adapted to tit into and form a tight joint in the annular groove d5of the section next below. The hollow `web portion d of the sections isprovided with one or more tire lines Z7 extending through them, in thepresent instance each section being provided with four such fines andthe sections are so arranged relative to one another that the lues cFot' the one section shall fall vertically opposite the intact webportion d ofthe section next above for the purpose of detlecting theproducts ot combustion in their passage upward through the sections,causing them to pursue a zigzag course and hence lie fora greater timein contact with the exposed surface of the sections, and hence impart tothe liquid therein a greater amount of heat.

The lower` section has its central hub portion conveniently closed bymeans of a crown piece E provided with an -annular groove e adapted toreceive the tongue d6 of the section D and said crown piece E is held inposition by means of a bolt rod F which extends downwardly .through thehub portions of the several sections and has a screw threaded en-lgagement with the crown piece E.

The uppermost of the sections, in the present instance the section D',has its hollow hub portion closed by means of a steam dome G, the lowerportion of which is provided with an annular tongue g adapted to fitwithin the IOO Q :secca annular groove d? of the upper section. The samebolt rod which holds the 'crown piece E in position, extends through thetop of the steam dome G and is there provided with a nut f, which, whenscrewed downonto the steam dome G, tends to draw the crown piece Esnugly into contact with the lower section CZ and at the same time thesteam dome G snugly into contact with the upper section D2.

To increase the circulation within the several hollow sections, Iprovide a central tube H, arranged vertically within the hollow hubportions of the sections, open-at top and bottom. The bolt rod F extendsthrough the tube I'I but leaves sufficient space between it and theinterior Wall of the tube for the circulation of the liquid.

For purposes of drawing the water out of the several hollow sections,they may each be provided with an outlet tube, such for example as thetube I, shown in connection with the section D which tubes may beprovided with suitable stop cocks of any well known or approved form andone'of such tubes, as for example I, may be utilized for the purpose ofintroducing water into the generator from a suitable supply, not shown.

Access to the interior of the furnace wall, for cleaning purposes, maybe had through suitable doors K, K and the fire-pot may be charged withfuel through a suitable door L opposite the opening Zin the peripheryofthe section D.

In use, the products of combustionpafter passing in their zigzag courseup through the Iiues in the several sections and through the chambersformed between two successive sections-pass downwardly around theexterior portions of the several generator sections between theirperipheries and the interior of the wallA to an opening at or near thebot tom of the generator section D leading to a suitable uptake, theopening and uptake not being shown herein.

It will be observed that the generator may be increased or diminished asto its capacity, by simply adding or removing one of the hol lowsections and that the latter may be furnished at pleasure andconveniently shipped separate from one another to be set up whereverdesired.

It is obvious that slight changes might be resorted to in the form andarrangement of the several parts without departing from the spirit andscope of my invention. Hence I do not wish to limit myself strictly tothe structure herein set forth, but

A steam generator, comprising a series of concavo-cou vex or disk shapedhollow sections having their outer hollow rims projected downwardly',the lower end of one rim being fitted to rest in proximity to the upperend of an adjacent rim to form an exterior hollow re wall, the shallowportions of the hollow sections forming upper and lower walls tocombustion chambers and fitted at their central portions to form acontinuous vertical water column when the sections are assembled, thesaid combustion chambers having communication with one another-and withthe fire pot through tire fines formed in said shallow portions of thesections, and means for holding the sections together, substantially asset forth.

ABNER A. PLUMMER.

Witnesses:

J. F. GARY, S. H. SEWARD.

